Motor



Aug. 17, 1937. M. P. DE MOTTE 2,090,575

oron Filed 001;. 24, 1931 2 Sheets-Sheet 1 INVENTOR 2 I W W95 ie BY ATTORN EY5 Aug. 17, 1937. M. P. DE MOTTE MOTOR 2 Sheets-Sheet 2 Filed Oct. 24, 1931 INVENTOR: WQz- M B Y ATTORNEYS Patented Aug. 17,1931

UNITED STATES MOTOR Maurice P. De Motte, Indianapolis, Ind., assignor, by mesne assignments, to Union Carbide and Carbon Corporation, a corporation of New York Application October 24, 1931, Serial No. 570,929

' 5 Claims.

This invention relates to a fluid pressure motor that derives power from the movement of .gas drawn from an acetylene generator to actuate the carbide feed valve thereof.

5 One object of the invention is to provide a motor having a speed proportional to the amount of gas drawn from the generator. Another ob- 'ject is to provide a motor that is not affected by moisture that condenses therein. Other ob- 10 jects are to provide a motor that is simple in structure, economical to manufacture, positive in action, and reliable in operation. Still \pther aims, objects, and novel features will be apparent from the following specification and the ac- 1 companying illustration, in which Fig. 1 is a vertical sectional view {of my improved motor,

Fig. 2 is a fragmentary vertical sectional view of an acetylene generator having my improved motor therein, r

Fig. 3 is at fragmentary plan view of a detail of the connection between my improved motor and the carbide valve shown in Fig. 2.

Fig. 4 is an end view of the valve trip mechanism shown in Fig. 1, 25 Fig. 5' is a fragmentary view of the outer en of;.valve shaft 31,

Fig. 6 is an isolated view of yoke 41,

Fig. 7 is a fragmentary view of the lower end i the generator casing and gas' enters the two chambers through two inlets and leaves the 40 chambers through an outlet that is also the,

outlet for the acetylene generator. The valve comprises two spaced pistons on a valve shaft that is provided with an exterior guide and two stop collars to limit its range of movement. The motor shaft is carried by a bearing at each side of the diaphragm to which it is attached, and one bearing is provided with a suitable packing. This shaft is indirectly connected to the carbide valve and is also provided with two trip collars to trip the valve mechanism.

The valve mechanism comprises a. spring carried under tension between a trip arm movable by the trip collarsand a thrust arm that moves the valve shaft. During operation gasenters one of the chambers and moves the diaphragm in one direction until one trip collar has moved the trip spring past the center line of the thrust arm and the trip spring has moved the valve shaft to the other limit of its range of movement. This admits gas to the opposite side of the diaphragm which then moves in the other direction until the valve is again tripped. The spring precludes arrest of the valve in a dead center position.

Qne example of my improved motor is shown in Fig. 1. This motor comprises two housing sections l and II having complementary vertiv.cal. faces with a cavity in each between which a flexible diaphragm I2 is clamped by means of a plurality of bolts l3 and nuts I4. A horizontal Y shaft or piston rod i is carried in a bearing or socket It in housing section II) and passes through the diaphragm l2 and a bearing l1 in housing section ll. This shaft extends some distance beyond the motor' and is connected to the carbide valve of the generator by means that will be described later, and bearing I1 is provided with a gland it having a packing l9 and an adjustable gland nut 20.

A portion of shaft l5 adjacent diaphragm l2 diaphragm supports 24 and 25 to .each side of the diaphragm, respectively.

' A valve casing 26 is secured to the under side of housingsections l0 and H by a plurality of cap screws or bolts 21. This casing has a horizontal cylindrical valve passage 28 extending therethrough below chambers 30 and 32. A vertical valve port 29 connects the top of this passage with the bottom of chamber 30 in housing section Ill and a similar valve port 3| connects this passage with chamber 32 in housing section II in a similar manner. A vertical exhaust port 33 also connects thebottom of this passage with outlet 34 and this exhaust port 33 enters the valvepassagejll between valve ports 29 and 3|.

Valve passage 28 is provided with a valve comprising spaced pistons 35 and 36 carried by or is provided with a threaded enlargement 2| upon which nuts 22 and 23 are threaded to clamp valve stop collars 49 and 44, one at each side of projection 99, to limit its range of movement. The support 99 is preferably U-shaped with substantially parallel sides or arms I99 and I99. 5 Upon a stud 45 extending inward from arm I99 of support 99 a valve trip spring thrust arm or lever 49 is pivoted. The lower end of this arm fits somewhat loosely in a yoke 41 that is pivoted in the outer end of shaft 91. This arm 49 carries a stud 49 in the lower end thereof to which one end of a valve trip spring 49 is connected. The upper end of this spring is carried by the lower end of a valve trip arm or lever 59 that is pivoted on a stud 5| extending inwardfrom arm I99 of support 39 in vertical alinement with stud,

45. The upper end of valve trip arm 59 is located between two valve trip collars 52 and 59 secured to shaft l5 by suitable means, such as pins 54. A valve mechanism cover 55 is secured to housing section I I and valve casing 29 by bolts 21 and 55. This cover 55 encloses the outer end of motor shaft l5, valve shaft 91, and the interconnecting valve mechanism, and' it is provided with a gas inlet 42'. v

25 This motor operates as follows: Starting with the parts in the positionshown in Fig. 1, gas enters inlets 42' and 42, passes through valve passage 29 and valve port 9| into chamber 92. Pressure of this gas on diaphragm |2 moves it 90 to the left. This movement continues until valve tripcollar 59 by moving the upper end of valve trip arm 59 to the left has-moved the lower end I of this arm carrying valve trip spring 49 far enough to the right of the axis of thrust arm 49 to produce a component of force of spring 49 in that direction suillcient to overcomethe friction of the valve parts, and move shaft 91 by means of arm 49 and yoke 41 to the right until the movement of valve stop collar 49 is arrested by projection. 99. With the valve in this position gas enters inlet 4| and passes through valve passage-29 and valve port 29 into chamber 99. Pressure of this gas moves-the diaphragm to the right and the gas in chamber 92 passes out through valve 5 port'll and the space between valve pistons 95 and 99 to exhaust port 99 and outlet 94. When valve trip collar 52 has moved valve trip arm 59 for enoughjo the right valve trip spring 49 will instantly move valve shaft 91 and the valve back to the position shown in Pig. 1. Therefore, as long as gasis being drawn' from the outlet 94 of the motor, the movable parts of the motor will continue to oscillate.

Means of transmitting movement from the motor to the carbide valve is shown in Figs. 2 and 3. These figures show a portion of an acetylene generator having a casing 51 and a carbide hopper 59. A valve 59 is carried by a vertical shaft .99 at the outlet of hopper 59. This shaft is car- I ried by supports 9| and in which it is free to rotate andalso oscillate vertically. Thevertical movement is controlled by an arm 99 and a link 94 by which it is attached -'to a diaphragm 95 responsive to the pressure within the generator.

' One side of valve 59 is provided with a projecting arm 99 having an opening 99a in which one end of a link or rod 91 is movably mounted. The other end oi link 91 is movably mounted in an I opening |5a in the outer end of shaft l5 of my improved motor 99 which is carried by supports 99 within casing 51. The outlet 94 of motor 99 is connected to a pipe 19 that leads outward through casing 51 and forms :the outlet of the generator. During operation of this generator by theme of a heating stove or illuminating burner, gas is drawn from pipe I9 motor 99 causing shaft II to reciprocate and oscillate valve 59 and shaft 99 in supports II and 92. As the pressure of the gas within the generator is reduced diaphragm and its associated mechanism opens carbide valve 59 in a manner well known in the art. Therefore, as long as gas is being drawn from the generator carbide feed valve "will be oscillated by motor 99 and carbide will feed past the valve at a more uniform rate than it would if it were not oscillated. Furthermore. the speed of oscillation will be proportional to the amount of gas drawn from the generator and consequently in proportion to the'amount of carbide fed past the-feed valve. This variable movement provides a better carbide feed than one that does not vary according to the amount of carbide required by the generator.

By locating the motor within the generator casing any slight leaks through gland l9 or past valve pistons 95 and 99. will cause no detrimental result whatever. It will beseen that it is unnecessary to provide packing on the valve stem. which packing. might cause the stem to bind and interfere with the free operation oi the valve. Also, by locating the valve ports 29 and 9| at the botwithin chambers 99 and 92 will be drained into the inside of the generator casing or into the outlet 94 and therefore will not interfere with.

the operation of the motor.

It is the object of this motor to cause the agitation or movement of the carbide valve when gas is drawn from the generator, but the type of motion and the means for conveying it may be different from that shown. Where no material tom of the housing any moisture that condenses has been mentioned it is understood that the parts are constructed of materials well known in the art, and where they are mentioned it is under.- stood that equivalent materials may be substituted. These and other changes, substitutions,

' ing; a valve in said'pasage for alternately connecting each of saidchambers with one of said inlets respectively; a valve stem connected to said valve and passing freely out of said pasage; and means for operating said stem'in response to movements of said piston element, said operating means including means for holding said valve in an operative position for substantially the full stroke of said piston element and for precluding them of said valve in a dead center position.

2. In amotor; ahousinghavingtwochamhers therein; a diaphragm separating said chambers; a motor shaft joined to said diaphragm and extending outward through said housing; a valve passagethroughsaidhousinghavinganinletat 'eachendthereoflocatedbelowsaidchambers;

avalveportleadingfromths bottomofeaohoi' saidchamberstothetopofsaidvalvepamage; an exhaust port leading downward bottom of said valve passage to the outside of saidmotor; avaivefreelymovablebstweenlimits in said valve passage; and-means for operating said valve by-said motor shaft, said operating means including "means for. caudng said valve to hold in the nm'mal operating positionduring substantially the full stroke of said motor shaft and for precluding the arrest of said valve in a position closing oil? said valve ports.

3. In a motor comprising a housing a hori- 5 zontal reciprocating motor shaft; a valve; a horizontal reciprocating valve shaft connected to said valve and extending externally of said housing out of contact therewith; a yoke carried by the outer end of said valve shaft; a support carried by said housing; a valvetrip spring thrust arm pivoted to said support and movable in said yoke;

a valve trip arm pivoted to said support in vertical alinement with the pivot of said thrust arm to change the direction of force applied to said i thrust arm; a valve trip spring carried under tension between thelower end of said valve trip arm and said thrust arm to apply force to said thrust arm; and'means carried by said motor shaft for moving said valve trip arm to move gosaid valve quickly from one limit of its travel to the other. v

4. In a motor having a piston element and a valve for controlling the direction of movement thereof; a housing for said valve having ends open externally; a piston rod secured to said piston; a lever; means on said piston rod for moving said lever; a spring operably connected with said lever so that the direction of pull thereof is changed by the position of said lever; an

arm operably connected with said spring and movable thereby in either direction between two limits of travel according to the position of said lever; a valve stem secured to said valve passing freely through one of said open ends; a yoke operably connecting said arm and said valve stem; and means for limiting the movement of said valve stem.

5. In a motor; a housing; a diaphragm in said housing; a motor shaft connected to said diaphragm and extending outwardly through one wall of said housing; two valve trip collars on said motor shaft; a support carried by said housing; a' valve passage adjacent the lower portion of said housing having ends open to the ambient atmosphere; a valve in said passage; a valve stem joined to said valve passing freely through one of said open ends and movably guided in said support; a stop collar on said valve stem at each side of said support to limit the movement of said valve; a yoke carried by said valve stem; a thrust arm having one end mounted on a pivot secured to said support and one end movable in said yoke with said valve-stem; a spring having one end secured to the free end of said thrust arm; a

valve trip lever pivoted on said support having a movable arm secured to the other end of said spring to change the direction of the moving force applied to said thrust arm, and an integral arm disposed between said trip collars to move said lever.

- MAURICE P. DE M0'1'I'E.- 

